B08_140L6322Q0031_-_Attachment_04_-_Final_Report_8Nov2021.pdf

TECHNICAL MEMORANDUM

Technical Memorandum 1 Black Rapids Airstrip Characterization and Removal Action Final Report

Black Rapids Airstrip Characterization and Removal Action Final Report

Date: 5 November 2021 Revision: Final Contract: W911KB19C0016 Project: Bureau of Land Management Mining Claims Inventory: Black Rapids Removal Action To: U.S. Army Corps of Engineers Copy to: Bureau of Land Management From: Brice Engineering, LLC Attachments: Attachment 1 – Figures

Attachment 2 – Photograph Log Attachment 3 – Analytical Results Attachment 4 – Field Notes Attachment 5 – Waste Documentation Attachment 6 – Transformer Documents

This Technical Memorandum (Tech Memo) describes site activities during a 2020 removal action at the Black Rapids Airstrip located near Delta Junction, Alaska. Brice Engineering, LLC (Brice) performed the work described herein for the U.S. Army Corps of Engineers (USACE) and Bureau of Land Management (BLM) under Contract W911KB19C0016.

Fieldwork was conducted in accordance with the Final BLM Mining Claims Survey and Investigation Work Plan (Work Plan, Brice 2019); the Black Rapids Airstrip Characterization and Removal Action Work Plan (RA Work Plan, Brice 2020); Title 18 of the Alaska Administrative Code (AAC) Chapter 75, Oil and Other Hazardous Substances Pollution Control Regulations (Alaska Department of Environmental Conservation [ADEC] 2020); and the ADEC Field Sampling Guidance (ADEC 2019).

1.0 INTRODUCTION

The objective of this project was to remove abandoned infrastructure, equipment, and material from a site adjacent to the Black Rapids Airstrip located immediately east of the Richardson Highway near Mile 227.5, approximately 38 miles south of Delta Junction, Alaska (Attachment 1, Figures 1 and 2).

Buildings and equipment to be removed included:

• A Quonset-style garage structure with concrete foundation

• Two generators

• Two aboveground storage tanks (ASTs) and piping

• Fluorescent light fixtures with ballasts and bulbs

• Miscellaneous materials, appliances, and debris

Technical Memorandum 2

In 2017, two potential contaminant releases associated with aboveground fuel tank flow lines and a sump in the garage floor were identified. Soil associated with these potential releases was targeted for removal and offsite disposal during the 2020 removal action.

1.1 Physical Setting and Site Conditions

The project site is at the south end of the Black Rapids Airstrip, which runs parallel with and adjacent to the Richardson Highway. The Delta River floodplain lies immediately west of the Richardson Highway at this location with the main channel of the river approximately 1,300 feet west of the site. The Black Rapids Airstrip itself is open to general aviation, though the condition of the runway was observed to be overgrown and surrounded by alder, willow, and cottonwood. Information about the airstrip is available online at https://airnav.com/airport/5BK.

1.2 Structures and Debris

A 16-foot-tall, 30-foot by 75-foot Quonset-style garage structure on a concrete pad was located on the south end of the Black Rapids Airstrip (Attachment 1, Figure 2). This modified Quonset-style garage structure consisted of a steel frame with limited wood bracing. The west and east ends of the building were constructed of painted plywood and roofed with corrugated steel sheets. Spray-on insulation, rigid foam insulation, and fiberglass batting was also used. Original fixtures included two 7- to 10-kilowatt generators, 15 fluorescent light fixtures with ballasts and bulbs, a 1,000-gallon Fuel Tanker AST, a 500-gallon AST, piping associated with both AST tanks, and a hot-water radiant heating system. The 1,000-gallon tanker was originally designed to be mounted on a truck frame; the tanker had been removed from the frame and placed on concrete piers or pedestals, which provided elevated support for the 1,000-gallon

AST.

In recent years, this structure had been used for storage and contained considerable quantities of appliances and pieces of equipment. Miscellaneous supplies associated with welding and building maintenance were also stored in the structure.

In 2017, the BLM conducted a limited site investigation. Based on the features existing onsite during this investigation, suspected waste materials included heating oil, diesel fuel, antifreeze, engine oil, and possibly gasoline. The 2017 site investigation also noted petroleum odor in the soil beneath the pipe connection at the 1,000-gallon Fuel Tanker AST, in soil outside the southeast corner of building where the supply lines for the generators emerge from the ground, and in the sump in the garage floor. The design of the sump was unknown; however, a 4-inch-thick mat beneath the steel grate covering the sump was found to have a 2-foot-deep void beneath it. When the mat was punctured, a strong petroleum odor was observed, apparently coming from the void (Northwind 2018).

Additionally, the following observations were made during the 2017 limited site investigation:

• The two generators appeared to contain engine oil and antifreeze. Two batteries were connected to the generators.

• The 500-gallon AST appeared to contain several inches of liquid with a diesel odor.

• Dry wall and paint used in the building were tested for asbestos and lead. No asbestos or lead was detected.

• The 15 fluorescent light fixtures with ballasts and bulbs were stated to potentially contain polychlorinated biphenyls (PCBs).

Technical Memorandum 3

2.0 FIELD ACTIVITIES

The following sections describe activities conducted during the 2020 removal action and 2021 waste disposal. Field notes are provided in Attachment 4.

2.1 Mobilization

On 29 September 2020, the Brice field team mobilized from Anchorage by road. The Brice field team included a site superintendent, a surveyor, and an environmental scientist. Heritage Rock & Services, located in Delta Junction, was subcontracted to provide civil services, which included equipment and operators. Prior to the arrival of the Brice field team, heavy equipment necessary to perform the task was staged at the site, including a 300-class excavator with demolition and cleanout buckets, an 800-class wheeled loader, and tracked skid loader. A 75-class excavator was used to complete smaller remedial soil excavations, and dump trucks were used for hauling building debris and concrete as well as backfill for final site restoration. Dump trucks included a 20-yard side dump truck, a 12-yard dump truck, and a single 12-yard pup trailer. Mobilization to the project location was completed in 1 day and personnel lodged in Delta Junction for the duration of field activities.

2.2 Site Inventory

During the initial phase of identifying and segregating materials from within and around the building, Brice personnel photographed (Attachment 2), surveyed, and documented the nature and locations of all debris to be removed from the site. Building corners and key site features were surveyed prior to beginning demolition and removal activities. Any items of importance outside the garage designated for removal, such as the ASTs, were surveyed individually. All surveying activities were carried out with a Trimble Geo X7 Mapping Grade Global Positioning System (GPS) equipment following procedures outlined in the Work Plan (Brice 2019).

2.3 Segregation and Containerization of Hazardous Materials

Hazardous materials were identified in several pieces of equipment removed from in and around the Quonset-style garage structure. Substances considered hazardous materials were segregated from other materials determined to be solid waste and containerized for disposal. Material identified as hazardous waste included:

• Fluorescent light fixtures and ballasts

• Oil-based lubricants and fluids removed from generators, radiators, and compressors

• 12-volt batteries

• Diesel fuel drained from two ASTs

Fluorescent bulbs were removed from all light fixtures, and light fixtures and ballasts were removed/ uninstalled from ceiling mounts inside of the building. All fluids were drained from generators, radiators, and compressors, placed in U.S. Department of Transportation (DOT) approved containers, and labeled for disposal. After being emptied of oil-based lubricants and fluids, generators, radiators, and compressors, along with other appliances and debris, were transported to the Delta Junction Landfill and disposed of as inert waste. Refrigeration appliances were left intact and containerized for transport and final disposal at the Delta Landfill. Two 12-volt batteries were recycled at an auto parts retailer in Delta Junction (Section 4).

Technical Memorandum 4

During the debris and appliance removal activities, Brice personnel encountered a transformer thought to possibly contain PCB oil, and a “Hotzy” hot water pressure washer containing what appeared to be thermal systems insulation (TSI) that was likely asbestos-containing material (ACM). An Asbestos Hazard Emergency Response Act (AHERA) Certified sampler collected one sample of the suspected ACM. The sample was submitted to ATC Service Group in Anchorage for analysis using polarized light microscopy (PLM). Analysis results confirmed that the TSI contained 12 percent (%) amosite and 5% chrysotile asbestos. Both the transformer and “Hotzy” were containerized in DOT-approved containment and staged for removal from the site.

Brice personnel contacted the transformers manufacturer in June 2021 and was provided manufacturer documentation (Attachment 6). A transformer specialist at Square D/Schneider Electric also verified that 45T3H transformer is a dry type transformer, indicating that it was not designed to use PCB oil. The transformer specialist also stated Square D/Schneider Electric has never used PCB-type coolants in their transformers or any transformers manufactured for them. Based on review of the manufacturer documentation and discussion with the transformer specialist, the transformer was disposed of as solid waste.

The 1,000-gallon Fuel Tanker AST on the south side of building was drained, recovering approximately

0.25 gallons of diesel fuel and water. Similarly, 95 gallons of diesel fuel was drained from the 500-gallon AST north of the building. All fuel was pumped into two 55-gallon drums, labeled, and staged for disposal.

The empty ASTs were staged for decommissioning and recycling (Section 2.7).

2.4 Building Demolition

The Quonset-style garage structure was demolished by removing the external sheeting and structural support. The demolished building material was stockpiled temporarily on the cement slab. Spray foam insulation and the metal exterior sheeting could not be separated efficiently and was disposed of as general construction debris rather than recycled. A snow fence anchored by T-posts was installed around the entire project area to prevent wind-blown lightweight debris from leaving the project site.

After complete demolition of the free-standing structure, stockpiled demolition waste was loaded into dump trucks and transported to the Delta Junction Landfill. Final demolition of the concrete pad was done concurrently with direct loading and trucking operations. Building demolition and associated infrastructure removal resulted in the transport and disposal of 156 cubic yards (cy) of demolition debris, concrete, and non-hazardous solid waste.

2.5 Excavation Activities

Two previously identified suspected contaminant releases in the vicinity of the garage structure were associated with the 1,000-gallon Fuel Tanker AST pipe connections and flow lines, and the sump in the garage floor. Soil removal activities resulted in a combined volume of 10 cy of contaminated soil removed:

4 cy from the sump excavation and 6 cy from the 1,000-gallon Fuel Tanker AST and piping. Excavated soil was placed into 1-cy supersacks and transported to the staging area, which was lined with 6-mil liner.

Following excavation activities, the walls and floor of the excavations were field screened with a photoionization detector (PID) in accordance with the RA Work Plan (Brice 2020). Analytical samples were collected from each excavation area in the location of the highest field screening results. Further detail is provided in the following sections.

Technical Memorandum 5

2.5.1 Sump Removal and Excavation

After the removal of the Quonset-style garage structure and prior to removal of the concrete slab, the sump in the garage floor was documented in a field logbook, photographed (Attachment 2, Photos 24 and 26), and mapped with survey equipment. The metal grate covering the sump in the garage floor was removed, which exposed a smooth-surfaced concrete sump approximately 1.5 feet wide by 4.5 feet long.

The sump had a solid concrete bottom and was filled with soil. Brice personnel removed the sump contents (soil) and placed them directly into a 1-cy supersack staged on 6-mil poly liner. No observable free flowing product or gross contamination was noted during this removal. With no observable contamination or odor on the concrete, the sump was dismantled and disposed of as general construction debris. A total of 4 cy of soil was excavated from around the location of the sump (Attachment 1, Figure 2). The final excavation measured 5 feet by 9.5 feet by 3 feet deep.

Field screening samples were collected from the excavation area and analyzed using a PID. Analytical samples were collected from the location with the highest PID result. A total of 18 field screening samples were collected from the side walls and floor, and results ranged from 2.6 to 7.5 parts per million (ppm).

Table 1 provides a summary of sample results. One primary analytical sample (20RA-BR-SO01), with an associated duplicate sample (20RA-BR-SO02), was collected from the east wall of the excavation (Attachment 1, Figure 4). The samples were submitted for the analysis of gasoline range organics (GRO), diesel range organics (DRO), residual range organics (RRO), volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), Resource Conservation and Recovery Act (RCRA) metals, and PCBs. Sample results are discussed in Section 3.

Excavated soil was placed directly into 1-cy supersacks and moved with a skid steer to the staging area.

After the excavation limits had been reached, the sample locations and excavation boundaries were surveyed, and the depths of the excavations were documented with field sketches and photos.

2.5.2 1,000-Gallon Fuel Tanker AST and Associated Piping Excavation

A total of 6 cy of soil was excavated from beneath the belly of the former location of the 1,000-gallon Fuel Tanker AST and from beneath the former location of the pipe that connected the AST with the side of the building (pipe run). The final excavation under the 1,000-gallon Fuel Tanker AST measured 5 feet by 5 feet by 3 feet deep. The adjoining excavation under the pipe run measured 5 feet by 2.6 feet by 2.5 feet deep.

A total of 16 field screening samples were collected from the 1,000-gallon Fuel Tanker AST section of the excavation and results ranged from 3.1 to 7.5 ppm. A total of ten field screening samples were collected from the pipe run section of the excavation and results ranged from 1.0 to 8.6 ppm. One primary analytical sample was collected from each of the two excavation areas at the field screening location with the highest PID result (Attachment 1, Figure 3). Sample 20RA-BR-SO03 was collected from the east wall of the pipe run excavation area and sample 20RA-BR-SO04 was collected from the floor of the 1,000-gallon Fuel Tanker AST excavation area. Both samples were submitted for the analysis of GRO, DRO, RRO, VOCs, SVOCs, RCRA metals, and PCBs. Sample results are discussed in Section 3.

Excavated soil was placed directly in 1-cy supersacks and moved with a skid steer to the staging area. After the excavation limits had been reached, the sample locations and excavation boundaries were surveyed, and the depth of the excavations were documented with field sketches and photos.

2.6 Field Screening of Fuel Line Run and Soil-Stained Area

During the initial stages of the concrete pad demolition, two 1-inch fuel lines were exposed beneath the east end of the foundation. No conduit, insulation, or bedding material was observed, though soil staining

Technical Memorandum 6 and fuel odor were documented. Brice personnel conducted PID field screening of the surface soils within an area that included the fuel line run and the stained soil located under the northeast corner of the former foundation. A total of 13 field screening samples were collected from the surface soil of this area and results ranged from 3.3 to 179.2 ppm. Within this area, the location of the garage generators contained stained surface soil; field screening results ranged from 50 to 150 ppm with two sample locations exceeding 150 ppm.

As the concrete foundation demolition continued, fuel odor and soil staining were documented extending approximately 31 feet west from northeast corner. After the demolition and removal of the concrete pad was complete, a total of 16 field screening samples were collected from the surface soil in this area and results ranged from 1.3 to 7.7 ppm.

Near the end of the project, there was an additional effort to further characterize and document the extent of contamination in the surface soil-stained areas associated with the garage generators in the northeast corner of the building. Five test pits were advanced to depths of 4 feet below ground surface at the surface soil locations with the highest PID results (Attachment 1, Figure 3). A total of 20 additional field screening samples, 4 per test pit, were collected at 1-foot intervals and PID results ranged from

7.1 ppm to 209.3 ppm.

2.7 Tank Decommissioning and Recycling

Prior to excavation activities, both ASTs were drained of fluids and transported to Heritage Rock & Services Equipment Laydown Yard for later decommissioning, which occurred after excavation activities were complete. Immediately before tank decommissioning, the interiors of the tanks were purged with compressed air for a minimum of 5 minutes. During the purging process, Breathing Zone air was monitored continuously for % of the Lower Explosive Limit (LEL) and % oxygen with a four-gas meter, as well as benzene with a PID fitted with a separator tube for benzene.

After the tanks had been purged for 5 minutes, the interior atmosphere was tested with a four-gas meter in an opening to the tank to confirm that the internal atmosphere did not pose a risk of ignition before decommissioning. After the tanks had been rendered inert, both were perforated with a 2-inch-diameter hole saw creating a 2-inch circular cut in the tanks at each end. Once tank decommissioning was complete, both ASTs were transported to C&R Pipe and Steel, Inc. in Fairbanks for recycling. Recycling receipts are provided in Attachment 5.

2.8 Site Restoration

Site restoration activities began after the demolition, soil removal, and sampling activities were completed. Clean fill was trucked from Delta Junction to fill excavation areas and to establish a final level site grade. Using hand tools and heavy equipment, the site was regraded to minimize the potential for pooling of water and to flatten any mounds created by heavy equipment operation. In addition to continuously picking up debris throughout the course of field activities, a final cleanup of the project site and surrounding tall shrub and tree line was completed prior to demobilization. All debris picked up during site restoration was considered inert construction debris and disposed of at the Delta Junction Landfill.

2.9 Demobilization

All heavy equipment was dry decontaminated onsite and demobilized back to Heritage Rock & Services in Delta Junction. All non-hazardous waste, petroleum-contaminated soil, ACM, and solid waste remaining onsite as described in Section 4 are containerized in DOT-approved containers and ready for transport.

Technical Memorandum 7

Following final site activities, subcontractor personnel returned to Delta Junction and the Brice field team demobilized to Anchorage by road on 6 October 2020. Due to winter weather, final disposal was performed in 2021.

2.10 2021 Waste Disposal

On 26 June 2021, Brice field personnel remobilized to Black Rapids with a Heritage Rock & Services truck and operator. All remaining waste, 10 cy of non-hazardous soil in 1-cy supersacks; two 55-gallon steel drums of diesel fuel, waste oil, PCB-containing light ballasts, and antifreeze; and the “Hotzy” were loaded onto a tractor trailer with a skid steer for transport. Waste was transported from Black Rapids to the Alaska Department of Natural Resources facility in Fairbanks for disposal. All waste disposal tickets are provided in Attachment 5.

3.0 SOIL CHARACTERIZATION

Excavation boundaries of the AST pipe connections, AST flow lines, and the sump were screened with a PID as described in 18 AAC 75 (ADEC 2020), ADEC’s Field Sampling Guidance (ADEC 2019), and Section 2.1 of the Sampling and Analysis Plan (SAP) included in the Work Plan (Brice 2019). Four excavation confirmation samples (three primary samples and one field duplicate) were collected from the AST pipe connections, AST flow lines, and the sump excavations onsite. All four samples were submitted to Pace Analytical in Mt. Juliet, TN for the analysis of GRO, DRO, RRO, VOCs, SVOCs, RCRA metals, and PCBs.

Sampling and analysis were conducted in accordance with the RA Work Plan (Brice 2020) and the Work Plan (Brice 2019).

3.1 Sampling Methods

Soil samples were collected and handled by ADEC-qualified environmental professionals and qualified samplers. One field duplicate was collected for three primary soil samples. The overall project-required minimum frequency of one for every 10 or fewer primary samples per matrix per analyte (10%) was met.

A matrix spike/matrix spike duplicate (MS/MSD) was collected and submitted with sample delivery group L1270733 and the overall project-required minimum frequency of one for every 20 or fewer primary samples (5%) was met. A trip blank accompanied the cooler containing samples for volatile analyses

(AK101/SW8260C).

All samples were received in good condition and cooler temperature upon receipt met acceptance criteria.

All samples were extracted and/or analyzed within the recommended holding times and were properly preserved for the analytical procedures used for this project.

The analytical data presented in this report were reviewed and results qualified in accordance with the quality assurance/quality control criteria defined in the Work Plan (Brice 2019). All data are considered usable in the context of project objectives.

3.2 Soil Sampling Results

Table 1 provides a summary of sample results. The complete analytical data tables are provided in Attachment 3.

Technical Memorandum 9

No material or equipment removed from the Quonset-style garage structure could be considered a source of arsenic. Given the lack of a known source of arsenic on this site and the characteristics listed above, the arsenic concentrations detected at this site are considered naturally occurring background.

4.0 WASTE MANAGEMENT AND DISPOSAL

All waste handling, transportation, and disposal activities were conducted in accordance with regulations put forth by the State of Alaska, the U.S. Environmental Protection Agency, and the DOT. Waste disposal has been performed in coordination with the BLM.

Ten 1-cy supersacks of contaminated soil were removed from the Sump Excavation, 1,000-gallon Fuel Tanker AST Excavation, and AST Fuel Line Excavation. One composite waste characterization sample (20RA-BR-SOWC01) was collected from the Sump Excavation soil (four supersacks). One composite waste characterization sample (20RA-BR-SOWC02) was collected from the 1,000-gallon Fuel Tanker AST and AST Fuel Line Excavations (six supersacks). The samples were submitted to Pace Analytical in Mt. Juliet, TN for the analysis of GRO, DRO, RRO, toxicity characteristic leaching procedure (TCLP) VOCs, TCLP metals, and PCBs. All waste characterization sample results were either non-detect or detected below criteria (40 Code of Federal Regulations 261.24 and 761 (Attachment 3).

In 2020, the decommissioned ASTs were transported to C&R Pipe and Steel, Inc. in Fairbanks for recycling;

light fixture ballasts and bulbs were packaged and transported to NRC Alaska, LLC (NRC) in Anchorage;

and two 12-volt batteries were recycled at Napa Auto Parts in Delta Junction. Building debris, concrete, metal mechanical equipment, and any other inert site debris were transported in dump trucks to the Delta Junction Landfill, located 44 miles north of the Black Rapids Airstrip site. Delta Junction Landfill deposit tickets are included in Attachment 5.

Ten cy of non-hazardous soil in 1-cy supersacks; two 55-gallon steel drums of diesel fuel, waste oil, and antifreeze; and the “Hotzy” were left onsite awaiting transportation to NRC in Fairbanks, Alaska, for disposal. These waste products were left onsite pending the waste characterization sample results and approval for transportation from ADEC. The transformer was determined to be solid waste (Attachment 6). Final disposal of these waste products was completed in June 2021, when all remaining waste was transported to US Ecology in Fairbanks for disposal. US Ecology waste disposal tickets are included in Attachment 5.

Table 2 summarizes the waste streams, quantities, waste characterization samples, and disposal locations for each waste stream.

Technical Memorandum 11

5.0 REFERENCES

Alaska Department of Environmental Conservation (ADEC). 2019. Field Sampling Guidance. Division of Spill Prevention and Response. Contaminated Sites Program. October.

ADEC. 2020. 18 Alaska Administrative Code (AAC) 75, Oil and Other Hazardous Substances Pollution Control Regulations. November.

Brice Engineering, LLC (Brice). 2019. Final Mining Claims Survey and Investigation Work Plan. October.

Brice. 2020. Final Black Rapids Airstrip Characterization and Removal Action Work Plan. September.

Mindat.org and the Hudson Institute of Mineralogy. 2021. Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USA. https://www.mindat.org/loc-203134.html. Accessed November 2021.

Northwind. 2018. Final Letter Report for the Limited Removal Action and Soil Sample Collection at the Black Rapids Airstrip Dump, Black Rapids, Alaska. January.

Office of the Federal Register (OFR). 2005. Hazardous Waste Operations and Emergency Response. Nation Archives and Records Administration. 29 Code of Federal Regulations 1910.120 and 1926.65.

October.

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ATTACHMENT 1

FIGURES

ATTACHMENT 2

PHOTOGRAPH LOG

Attachment 2 – Photograph Log i

Black Rapids Airstrip Characterization and Removal Action Photograph Log

TABLE OF CONTENTS

Photograph 1, 9/29/2020: Empty 1,000‐gallon Fuel Tanker AST, looking northwest Photograph 2, 9/29/2020: Fluorescent bulbs and ballasts containerized, looking northwest Photograph 3, 9/29/2020: Fixtures with ballasts removed, looking down Photograph 4, 9/29/2020: Diesel fuel transferred from 500‐gallon AST to 55‐gallon drums, looking southeast Photograph 5, 9/29/2020: Building with snow fence at end of day, looking northeast Photograph 6, 9/30/2020: Draining generator of fluids, looking northwest Photograph 7, 9/30/2020: Interior of building, clear of non‐hazardous solid waste, looking east Photograph 8, 9/30/2020: Exterior of building before demolition, looking northwest Photograph 9, 9/30/2020: Empty building, start of demolition, looking east Photograph 10, 9/30/2020: Building demolition, snow fence, caution tape, looking northwest Photograph 11, 9/30/2020: Boarded up main entry at end of day, looking east Photograph 12, 10/1/2020: Documentation and measurement of fuel lines beneath foundation, looking northwest Photograph 13, 10/1/2020: Fuel lines located under east end of foundation, looking west Photograph 14, 10/1/2020: Soil staining on northeast corner of foundation where fuel lines stubbed up through interior foundation, looking north Photograph 15, 10/1/2020: Complete demolition of building, ready for direct loading into trucks, looking east Photograph 16, 10/1/2020: Approximately 5 cy of segregated metal debris ready for direct load into trucks, looking west Photograph 17, 10/2/2020: Preparing for PID screening of 30‐foot by 10‐foot area in northeast corner of foundation, looking northwest Photograph 18, 10/2/2020: Loading demolition debris into 12‐yard dump truck and pup trailer Photograph 19, 10/2/2020: Concrete foundation demolition, looking west Photograph 20, 10/2/2020: Loading demolition debris into side‐dump truck, looking southeast Photograph 21, 10/2/2020: Project site with building and concrete foundation removed, looking west. 11 Photograph 22, 10/2/2020: Project site with building and concrete foundation removed, looking east. 11 Photograph 23, 10/2/2020: Soil staining and odor extending 31 feet from northeast corner of building, looking northeast Photograph 24, 10/2/2020: Sump intact and undamaged, looking east Photograph 25, 10/3/2020: Removal of 1,000‐gallon Fuel Tanker AST prior to transport offsite, looking northeast Photograph 26, 10/3/2020: Sump prior to demolition, looking east Photograph 27, 10/3/2020: Soil remediation after removal of sump, looking west Photograph 28, 10/3/2020: Soil removal beneath fuel line from 1,000‐gallon Fuel Tanker AST, looking north Photograph 29, 10/3/2020: Soil removal beneath 1,000‐gallon Fuel Tanker AST, looking northwest Photograph 30, 10/3/2020: Ten 1‐cy supersacks of soil from both excavations, looking southwest Photograph 31, 10/4/2020: Preparing for PID screening of sump excavation, looking east Photograph 32, 10/4/2020: Debris pickup and site cleanup, looking east Photograph 33, 10/4/2020: Fuel line excavation prior to screening and sampling, looking north Photograph 34, 10/4/2020: Area beneath 1,000‐gallon Fuel Tanker AST excavation prior to

Attachment 2 – Photograph Log ii screening and sampling, looking south Photograph 35, 10/4/2020: Area exposed beneath foundation with fuel odor and soil staining discovered 10/2/2020, looking north Photograph 36, 10/4/2020: Supersacks labeled and ready for transport, pending analytical results, looking north Photograph 37, 10/4/2020: End of day site photo, looking east Photograph 38, 10/5/2020: Backfilling excavations, looking southeast Photograph 39, 10/5/2020: Test pitting staining in northeast corner of building to 4 feet bgs, looking north Photograph 40, 10/5/2020: Test pitting staining in northeast corner of building to 4 feet bgs, looking northeast Photograph 41, 10/5/2020: Final site restoration, looking east Photograph 42, 10/5/2020: Site restoration, looking west Photograph 43, 10/5/2020: Waste POL, anti‐freeze, transformer, and welder containing ACM in containment for transport and disposal, looking north Photograph 44, 10/6/2020: Void clearing and air monitoring before 500‐gallon AST Decommissioning, looking west Photograph 45, 10/6/2020: Decommissioning 500‐gallon AST with hole‐saw, looking southwest Photograph 46, 10/6/2020: Decommissioned 500‐gallon AST with holes cut in both ends, looking west Photograph 47, 10/6/2020: Void clearing and air monitoring before decommissioning of 1,000‐gallon

Fuel Tanker AST, looking northwest Photograph 48, 10/6/2020: Decommissioned 1,000‐gallon Fuel Tanks AST with hole cut, looking north Photograph 49, 10/6/2020: Decommissioned 1,000‐gallon Fuel Tanker AST with hole cut, opposite side, looking south Photograph 50, 12/16/2020: Supersacks labeled and ready for transport. Looking north Photograph 51, 12/16/2020: Waste POL, anti‐freeze, transformer, and welder containing ACM in containment for transport, looking north

Attachment 2 – Photograph Log 1

Photograph 1, 9/29/2020: Empty 1,000‐gallon Fuel Tanker AST, looking northwest.

Photograph 2, 9/29/2020: Fluorescent bulbs and ballasts containerized, looking northwest.

Attachment 2 – Photograph Log 2

Photograph 3, 9/29/2020: Fixtures with ballasts removed, looking down.

Photograph 4, 9/29/2020: Diesel fuel transferred from 500‐gallon AST to 55‐gallon drums, looking southeast.

Attachment 2 – Photograph Log 3

Photograph 5, 9/29/2020: Building with snow fence at end of day, looking northeast.

Photograph 6, 9/30/2020: Draining generator of fluids, looking northwest.

Attachment 2 – Photograph Log 4

Photograph 7, 9/30/2020: Interior of building, clear of non‐hazardous solid waste, looking east.

Photograph 8, 9/30/2020: Exterior of building before demolition, looking northwest.

Attachment 2 – Photograph Log 5

Photograph 9, 9/30/2020: Empty building, start of demolition, looking east.

Photograph 10, 9/30/2020: Building demolition, snow fence, caution tape, looking northwest.

Attachment 2 – Photograph Log 6

Photograph 11, 9/30/2020: Boarded up main entry at end of day, looking east.

Photograph 12, 10/1/2020: Documentation and measurement of fuel lines beneath foundation, looking northwest.

Attachment 2 – Photograph Log 7

Photograph 13, 10/1/2020: Fuel lines located under east end of foundation, looking west.

Photograph 14, 10/1/2020: Soil staining on northeast corner of foundation where fuel lines stubbed up through interior foundation, looking north.

Attachment 2 – Photograph Log 8

Photograph 15, 10/1/2020: Complete demolition of building, ready for direct loading into trucks, looking east.

Photograph 16, 10/1/2020: Approximately 5 cy of segregated metal debris ready for direct load into trucks, looking west.

Attachment 2 – Photograph Log 9

Photograph 17, 10/2/2020: Preparing for PID screening of 30‐foot by 10‐foot area in northeast corner of foundation, looking northwest.

Photograph 18, 10/2/2020: Loading demolition debris into 12‐yard dump truck and pup trailer.

Attachment 2 – Photograph Log 10

Photograph 19, 10/2/2020: Concrete foundation demolition, looking west.

Photograph 20, 10/2/2020: Loading demolition debris into side‐dump truck, looking southeast.

Attachment 2 – Photograph Log 11

Photograph 21, 10/2/2020: Project site with building and concrete foundation removed, looking west.

Photograph 22, 10/2/2020: Project site with building and concrete foundation removed, looking east.

Attachment 2 – Photograph Log 12

Photograph 23, 10/2/2020: Soil staining and odor extending 31 feet from northeast corner of building, looking northeast.

Photograph 24, 10/2/2020: Sump intact and undamaged, looking east.

Attachment 2 – Photograph Log 13

Photograph 25, 10/3/2020: Removal of 1,000‐gallon Fuel Tanker AST prior to transport offsite, Photograph 26, 10/3/2020: Sump prior to demolition, looking east.

Attachment 2 – Photograph Log 14

Photograph 27, 10/3/2020: Soil remediation after removal of sump, looking west.

Photograph 28, 10/3/2020: Soil removal beneath fuel line from 1,000‐gallon Fuel Tanker AST, looking north.

Attachment 2 – Photograph Log 15

Photograph 29, 10/3/2020: Soil removal beneath 1,000‐gallon Fuel Tanker AST, looking northwest.

Photograph 30, 10/3/2020: Ten 1‐cy supersacks of soil from both excavations, looking southwest.

Attachment 2 – Photograph Log 16

Photograph 31, 10/4/2020: Preparing for PID screening of sump excavation, looking east.

Photograph 32, 10/4/2020: Debris pickup and site cleanup, looking east.

Attachment 2 – Photograph Log 17

Photograph 33, 10/4/2020: Fuel line excavation prior to screening and sampling, looking north.

Photograph 34, 10/4/2020: Area beneath 1,000‐gallon Fuel Tanker AST excavation prior to screening and sampling, looking south.

Attachment 2 – Photograph Log 18

Photograph 35, 10/4/2020: Area exposed beneath foundation with fuel odor and soil staining discovered 10/2/2020, looking north.

Photograph 36, 10/4/2020: Supersacks labeled and ready for transport, pending analytical results, Attachment 2 – Photograph Log 19

Photograph 37, 10/4/2020: End of day site photo, looking east.

Photograph 38, 10/5/2020: Backfilling excavations, looking southeast.

Attachment 2 – Photograph Log 20

Photograph 39, 10/5/2020: Test pitting staining in northeast corner of building to 4 feet bgs, Photograph 40, 10/5/2020: Test pitting staining in northeast corner of building to 4 feet bgs, Attachment 2 – Photograph Log 21

Photograph 41, 10/5/2020: Final site restoration, looking east.

Photograph 42, 10/5/2020: Site restoration, looking west.

Attachment 2 – Photograph Log 22

Photograph 43, 10/5/2020: Waste POL, anti‐freeze, transformer, and welder containing ACM in containment for transport and disposal, looking north.

Photograph 44, 10/6/2020: Void clearing and air monitoring before 500‐gallon AST Decommissioning, looking west.

Attachment 2 – Photograph Log 23

Photograph 45, 10/6/2020: Decommissioning 500‐gallon AST with hole‐saw, looking southwest.

Photograph 46, 10/6/2020: Decommissioned 500‐gallon AST with holes cut in both ends, looking west.

Attachment 2 – Photograph Log 24

Photograph 47, 10/6/2020: Void clearing and air monitoring before decommissioning of 1,000‐gallon Fuel Tanker AST, looking northwest.

Photograph 48, 10/6/2020: Decommissioned 1,000‐gallon Fuel Tanks AST with hole cut, looking north.

Attachment 2 – Photograph Log 25

Photograph 49, 10/6/2020: Decommissioned 1,000‐gallon Fuel Tanker AST with hole cut, opposite side, looking south.

Photograph 50, 12/16/2020: Supersacks labeled and ready for transport. Looking north.

Attachment 2 – Photograph Log 26

Photograph 51, 12/16/2020: Waste POL, anti‐freeze, transformer, and welder containing ACM in containment for transport, looking north.

ATTACHMENT 3

ANALYTICAL RESULTS

2020 BLM MINING CLAIMS SURVEY AND INVESTIGATION

Analytical Results for Black Rapids Removal Action ‐ Soil

20RA‐BR‐SO01 20RA‐BR‐SO02 20RA‐BR‐SO03 20RA‐BR‐SO04 20RA‐BR‐TripBlank BR‐SO01 BR‐SO02 BR‐SO03 BR‐SO04 Trip Blank

L1270733‐01 L1270733‐02 L1270733‐03 L1270733‐04 L1270733‐05/06

10/4/2020 12:00:00 PM 10/4/2020 12:20:00 PM 10/4/2020 1:40:00 PM 10/4/2020 2:30:00 PM 10/4/2020 0:00:00 AM Soil Soil Soil Soil Soil QC/Water QC

MS/MSD Dup of 20RA‐BR‐SO01 Primary Primary Trip Blank Method Analyte PSL

1 Units

AK101 Gasoline Range Organics 300 mg/kg 1.58 [0.662] J, B, QN 0.710 [0.553] J, B, QH 2.31 [0.608] J, B, QH 0.811 [0.624] J, B, QH 0.625 [0.50] J, B

AK102/103 Diesel Range Organics 250 mg/kg 11.3 [7.51] J 20.0 [7.50] J ND [7.38] 23.4 [8.39] J ‐‐

AK102/103 Residual Range Organics 10000 mg/kg 72.7 [15.0] J 159 [15.0] 27.2 [14.7] J 115 [16.7] J ‐‐

SW6020B Arsenic 0.2 mg/kg 138 [0.458] QN 98.7 [0.457] 117 [0.450] 85.7 [0.511] ‐‐

SW6020B Barium 2100 mg/kg 25.8 [1.36] 40.2 [1.35] 19.2 [1.33] 44.1 [1.51] ‐‐

SW6020B Cadmium 9.1 mg/kg ND [0.440] ND [0.440] ND [0.433] ND [0.492] ‐‐

SW6020B Chromium 100000 mg/kg 6.84 [2.43] 9.97 [2.43] 5.08 [2.39] J 12.0 [2.71] ‐‐

SW6020B Lead 400 mg/kg 12.2 [1.08] 16.1 [1.08] 8.26 [1.07] 20.7 [1.21] ‐‐

SW6020B Selenium 6.9 mg/kg ND [1.10] ND [1.09] ND [1.08] ND [1.22] ‐‐

SW6020B Silver 11 mg/kg ND [0.231] ND [0.231] ND [0.227] ND [0.258] ‐‐

SW7471B Mercury 0.36 mg/kg 0.0977 [0.0195] 0.0655 [0.0195] 0.0320 [0.0192] J 0.0523 [0.0218] ‐‐

SW8082A Aroclor 1016 1 mg/kg ND [0.0128] ND [0.0128] ND [0.0126] ND [0.0143] ‐‐

SW8082A Aroclor 1221 1 mg/kg ND [0.0128] ND [0.0128] ND [0.0126] ND [0.0143] ‐‐

SW8082A Aroclor 1232 1 mg/kg ND [0.0128] ND [0.0128] ND [0.0126] ND [0.0143] ‐‐

SW8082A Aroclor 1242 1 mg/kg ND [0.0128] ND [0.0128] ND [0.0126] ND [0.0143] ‐‐

SW8082A Aroclor 1248 1 mg/kg ND [0.00801] ND [0.00800] ND [0.00787] ND [0.00894] ‐‐

SW8082A Aroclor 1254 1 mg/kg ND [0.00801] ND [0.00800] ND [0.00787] ND [0.00894] ‐‐

SW8082A Aroclor 1260 1 mg/kg ND [0.00801] ND [0.00800] ND [0.00787] 1.19 [0.0179] ‐‐

SW8260D 1,1,1,2‐Tetrachloroethane 0.022 mg/kg ND [0.00103] ND [0.00103] ND [0.00122] ND [0.00122] ND [0.000147]

SW8260D 1,1,1‐Trichloroethane 32 mg/kg ND [0.00100] ND [0.00100] ND [0.00118] ND [0.00120] ND [0.000149]

SW8260D 1,1,2,2‐Tetrachloroethane 0.003 mg/kg ND [0.000754] ND [0.000753] ND [0.000889] ND [0.000902] ND [0.000133]

SW8260D 1,1,2‐Trichloro‐1,2,2‐trifluoroethane 310 mg/kg ND [0.000818] ND [0.000817] ND [0.000965] ND [0.000978] ND [0.000180]

SW8260D 1,1,2‐Trichloroethane 0.0014 mg/kg ND [0.000648] ND [0.000647] ND [0.000763] ND [0.000774] ND [0.000158]

SW8260D 1,1‐Dichloroethane 0.092 mg/kg ND [0.000533] ND [0.000532] ND [0.000628] ND [0.000636] ND [0.000100]

SW8260D 1,1‐Dichloroethene 1.2 mg/kg ND [0.000657] ND [0.000657] ND [0.000775] ND [0.000785] ND [0.000188]

SW8260D 1,1‐Dichloropropene NS mg/kg ND [0.000878] ND [0.000877] ND [0.00104] ND [0.00105] ND [0.000142]

SW8260D 1,2,3‐Trichlorobenzene 0.15 mg/kg ND [0.00795] QL ND [0.00794] QL ND [0.00938] QL ND [0.00950] QL ND [0.000230]

SW8260D 1,2,3‐Trichloropropane 0.000031 mg/kg ND [0.00176] ND [0.00176] ND [0.00207] ND [0.00210] ND [0.000237] SW8260D 1,2,3‐Trimethylbenzene NS mg/kg ND [0.00171] ND [0.00171] ND [0.00203] 0.0248 [0.00205] ND [0.000104]

SW8260D 1,2,4‐Trichlorobenzene 0.082 mg/kg ND [0.00477] QL ND [0.00477] QL ND [0.00563] QL ND [0.00571] QL ND [0.000481]

SW8260D 1,2,4‐Trimethylbenzene 0.61 mg/kg ND [0.00171] ND [0.00171] ND [0.00203] 0.0217 [0.00205] ND [0.000322]

SW8260D 1,2‐Dibromo‐3‐chloropropane NS mg/kg ND [0.00423] ND [0.00423] ND [0.00499] ND [0.00505] ND [0.000276]

SW8260D 1,2‐Dibromoethane 0.00024 mg/kg ND [0.000703] ND [0.000702] ND [0.000829] ND [0.000840] ND [0.000126]

SW8260D 1,2‐Dichlorobenzene 2.4 mg/kg ND [0.000461] ND [0.000461] ND [0.000544] ND [0.000551] ND [0.000107]

SW8260D 1,2‐Dichloroethane 0.0055 mg/kg ND [0.000704] ND [0.000703] ND [0.000830] ND [0.000841] ND [0.0000819]

SW8260D 1,2‐Dichloropropane 0.03 mg/kg ND [0.00154] ND [0.00154] ND [0.00181] ND [0.00184] ND [0.000149]

SW8260D 1,3,5‐Trimethylbenzene 0.66 mg/kg ND [0.00217] ND [0.00217] ND [0.00256] 0.00645 [0.00259] J ND [0.000104]

SW8260D 1,3‐Dichlorobenzene 2.3 mg/kg ND [0.000651] ND [0.000650] ND [0.000768] ND [0.000778] ND [0.000110]

SW8260D 1,3‐Dichloropropane NS mg/kg ND [0.000544] ND [0.000543] ND [0.000641] ND [0.000649] ND [0.000110]

SW8260D 1,4‐Dichlorobenzene 0.037 mg/kg ND [0.000759] ND [0.000759] 0.00109 [0.000895] J ND [0.000908] ND [0.000120]

QC Type

Sample ID Location Lab ID

Collection Date Matrix

20RA‐BR‐SO01 20RA‐BR‐SO02 20RA‐BR‐SO03 20RA‐BR‐SO04 20RA‐BR‐TripBlank BR‐SO01 BR‐SO02 BR‐SO03 BR‐SO04 Trip Blank

L1270733‐01 L1270733‐02 L1270733‐03 L1270733‐04 L1270733‐05/06

10/4/2020 12:00:00 PM 10/4/2020 12:20:00 PM 10/4/2020 1:40:00 PM 10/4/2020 2:30:00 PM 10/4/2020 0:00:00 AM Soil Soil Soil Soil Soil QC/Water QC

MS/MSD Dup of 20RA‐BR‐SO01 Primary Primary Trip Blank Method Analyte PSL

1 Units QC Type

Sample ID Location Lab ID

Collection Date Matrix

SW8260D 2,2‐Dichloropropane NS mg/kg ND [0.00150] ND [0.00150] ND [0.00177] ND [0.00179] ND [0.000161]

SW8260D 2‐Butanone 15 mg/kg 0.101 [0.0689] J, B, QH 0.0914 [0.0688] J, B, QH 0.122 [0.0812] J, B, QH 0.141 [0.0823] B, QH ND [0.00119]

SW8260D 2‐Chlorotoluene NS mg/kg ND [0.000938] ND [0.000937] ND [0.00111] ND [0.00112] ND [0.000106]

SW8260D 4‐Chlorotoluene NS mg/kg ND [0.000488] ND [0.000488] ND [0.000576] ND [0.000583] ND [0.000114]

SW8260D 4‐Isopropyltoluene NS mg/kg ND [0.00277] ND [0.00276] ND [0.00326] ND [0.00331] ND [0.000120]

SW8260D 4‐Methyl‐2‐pentanone 18 mg/kg ND [0.00247] ND [0.00247] ND [0.00292] ND [0.00296] ND [0.000478]

SW8260D Acetone 38 mg/kg ND [0.0396] ND [0.0396] ND [0.0467] ND [0.0474] ND [0.0113]

SW8260D Acrylonitrile NS mg/kg ND [0.00392] ND [0.00391] ND [0.00462] ND [0.00468] ND [0.000671]

SW8260D Benzene 0.022 mg/kg ND [0.000507] 0.000704 [0.000506] J 0.000959 [0.000597] J ND [0.000606] ND [0.0000941]

SW8260D Bromobenzene 0.36 mg/kg ND [0.000976] ND [0.000975] ND [0.00115] ND [0.00117] ND [0.000118]

SW8260D Bromodichloromethane 0.0043 mg/kg ND [0.000787] ND [0.000786] ND [0.000927] ND [0.000940] ND [0.000136]

SW8260D Bromoform 0.1 mg/kg ND [0.00127] ND [0.00127] ND [0.00149] ND [0.00151] ND [0.000129]

SW8260D Bromomethane 0.024 mg/kg ND [0.00214] ND [0.00213] ND [0.00252] ND [0.00256] ND [0.000605]

SW8260D Carbon tetrachloride 0.021 mg/kg ND [0.000974] ND [0.000973] ND [0.00115] ND [0.00116] ND [0.000128]

SW8260D Chlorobenzene 0.46 mg/kg ND [0.000228] ND [0.000228] 0.000352 [0.000269] J ND [0.000273] ND [0.000116]

SW8260D Chloroethane 72 mg/kg ND [0.00184] ND [0.00184] ND [0.00217] ND [0.00221] ND [0.000192]

SW8260D Chloroform 0.0071 mg/kg ND [0.00112] ND [0.00112] ND [0.00132] ND [0.00133] ND [0.000111]

SW8260D Chloromethane 0.61 mg/kg ND [0.00472] ND [0.00471] ND [0.00556] ND [0.00563] ND [0.000960]

SW8260D cis‐1,2‐Dichloroethene 0.12 mg/kg ND [0.000796] ND [0.000795] ND [0.000939] ND [0.000951] ND [0.000126]

SW8260D cis‐1,3‐Dichloropropene 0.018 mg/kg ND [0.000821] ND [0.000820] ND [0.000968] ND [0.000982] ND [0.000111]

SW8260D Dibromochloromethane 0.0027 mg/kg ND [0.000664] ND [0.000663] ND [0.000782] ND [0.000794] ND [0.000140]

SW8260D Dibromomethane 0.025 mg/kg ND [0.000814] ND [0.000813] ND [0.000959] ND [0.000973] ND [0.000122]

SW8260D Dichlorodifluoromethane 3.9 mg/kg ND [0.00175] ND [0.00174] ND [0.00206] ND [0.00208] ND [0.000374]

SW8260D Di‐isopropyl ether NS mg/kg ND [0.000445] ND [0.000444] ND [0.000524] ND [0.000532] ND [0.000105]

SW8260D Ethylbenzene 0.13 mg/kg ND [0.000800] ND [0.000799] ND [0.000942] ND [0.000956] ND [0.000137]

SW8260D Hexachlorobutadiene 0.02 mg/kg ND [0.00651] ND [0.00650] ND [0.00768] ND [0.00778] ND [0.000337]

SW8260D Isopropylbenzene 5.6 mg/kg ND [0.000461] ND [0.000461] ND [0.000544] ND [0.000551] ND [0.000105]

SW8260D Methyl tert‐butyl ether 0.4 mg/kg ND [0.000380] ND [0.000379] ND [0.000448] ND [0.000453] ND [0.000101]

SW8260D Methylene chloride 0.33 mg/kg ND [0.00720] ND [0.00720] ND [0.00850] ND [0.00860] ND [0.000430]

SW8260D Naphthalene 0.038 mg/kg ND [0.00529] ND [0.00529] ND [0.00625] ND [0.00633] ND [0.00100]

SW8260D n‐Butylbenzene 20 mg/kg ND [0.00570] ND [0.00569] ND [0.00672] ND [0.00681] ND [0.000157]

SW8260D n‐Propylbenzene 9.1 mg/kg ND [0.00103] ND [0.00103] ND [0.00122] ND [0.00124] ND [0.0000993]

SW8260D sec‐Butylbenzene 28 mg/kg ND [0.00312] ND [0.00312] ND [0.00369] ND [0.00373] ND [0.000125]

SW8260D Styrene 10 mg/kg ND [0.000248] ND [0.000248] ND [0.000293] ND [0.000297] ND [0.000118]

SW8260D tert‐Butylbenzene 11 mg/kg ND [0.00212] ND [0.00211] ND [0.00249] ND [0.00253] ND [0.000127]

SW8260D Tetrachloroethene 0.19 mg/kg ND [0.000972] ND [0.000971] ND [0.00115] ND [0.00116] ND [0.000300]

20RA‐BR‐SO01 20RA‐BR‐SO02 20RA‐BR‐SO03 20RA‐BR‐SO04 20RA‐BR‐TripBlank BR‐SO01 BR‐SO02 BR‐SO03 BR‐SO04 Trip Blank

L1270733‐01 L1270733‐02 L1270733‐03 L1270733‐04 L1270733‐05/06

10/4/2020 12:00:00 PM 10/4/2020 12:20:00 PM 10/4/2020 1:40:00 PM 10/4/2020 2:30:00 PM 10/4/2020 0:00:00 AM Soil Soil Soil Soil Soil QC/Water QC

MS/MSD Dup of 20RA‐BR‐SO01 Primary Primary Trip Blank Method Analyte PSL

1 Units QC Type

Sample ID Location Lab ID

Collection Date Matrix

SW8260D Toluene 6.7 mg/kg 0.00179 [0.00141] J, QN 0.00529 [0.00141] J 0.00672 [0.00166] 0.00496 [0.00168] J ND [0.000278]

SW8260D trans‐1,2‐Dichloroethene 1.3 mg/kg ND [0.00113] ND [0.00113] ND [0.00133] ND [0.00135] ND [0.000149]

SW8260D trans‐1,3‐Dichloropropene 0.018 mg/kg ND [0.00124] ND [0.00124] ND [0.00146] ND [0.00148] ND [0.000118]

SW8260D Trichloroethene 0.011 mg/kg ND [0.000634] ND [0.000633] ND [0.000747] ND [0.000757] ND [0.000190]

SW8260D Trichlorofluoromethane 41 mg/kg 0.00911 [0.000897] QN 0.0191 [0.000896] QN 1.22 [0.00106] ND [0.00107] ND [0.000160]

SW8260D Vinyl chloride 0.0008 mg/kg ND [0.00126] ND [0.00126] ND [0.00148] ND [0.00150] ND [0.000234]

SW8260D Xylenes (total) 1.5 mg/kg ND [0.000955] 0.00263 [0.000954] J 0.00192 [0.00113] J 0.00168 [0.00114] J ND [0.000174]

SW8270E 1,2,4‐Trichlorobenzene 0.082 mg/kg ND [0.0226] ND [0.0113] ND [0.0111] ND [0.0252] ‐‐

SW8270E 2,2‐OXYBIS(1‐CHLOROPROPANE) NS mg/kg ND [0.0312] ND [0.0156] ND [0.0154] ND [0.0349] ‐‐

SW8270E 2,4,6‐Trichlorophenol 0.092 mg/kg ND [0.0232] ND [0.0116] ND [0.0114] ND [0.0259] ‐‐

SW8270E 2,4‐Dichlorophenol 0.21 mg/kg ND [0.0210] ND [0.0105] ND [0.0103] ND [0.0235] ‐‐

SW8270E 2,4‐Dimethylphenol 3.2 mg/kg ND [0.0189] ND [0.00943] ND [0.00927] ND [0.0211] ‐‐

SW8270E 2,4‐Dinitrophenol 0.34 mg/kg ND [0.169] ND [0.0844] ND [0.0830] ND [0.189] ‐‐

SW8270E 2,4‐Dinitrotoluene 0.024 mg/kg ND [0.0207] ND [0.0103] ND [0.0102] ND [0.0231] ‐‐

SW8270E 2,6‐Dinitrotoluene 0.005 mg/kg ND [0.0236] ND [0.0118] ND [0.0116] ND [0.0264] ‐‐

SW8270E 2‐Chloronaphthalene 26 mg/kg ND [0.0127] ND [0.00634] ND [0.00624] ND [0.0142] ‐‐

SW8270E 2‐Chlorophenol 0.71 mg/kg ND [0.0239] ND [0.0119] ND [0.0117] ND [0.0267] ‐‐

SW8270E 2‐Nitrophenol NS mg/kg ND [0.0258] ND [0.0129] ND [0.0127] ND [0.0288] ‐‐

SW8270E 3,3'‐Dichlorobenzidine 0.056 mg/kg ND [0.0267] ND [0.0133] ND [0.0131] ND [0.0298] ‐‐

SW8270E 4,6‐Dinitro‐2‐methylphenol NS mg/kg ND [0.164] ND [0.0818] ND [0.0805] ND [0.183] ‐‐

SW8270E 4‐Bromophenyl phenyl ether NS mg/kg ND [0.0254] ND [0.0127] ND [0.0125] ND [0.0284] ‐‐

SW8270E 4‐Chloro‐3‐methylphenol NS mg/kg ND [0.0234] ND [0.0117] ND [0.0115] ND [0.0262] ‐‐

SW8270E 4‐Chlorophenyl phenyl ether NS mg/kg ND [0.0252] ND [0.0126] ND [0.0124] ND [0.0281] ‐‐

SW8270E 4‐Nitrophenol NS mg/kg ND [0.0226] ND [0.0113] ND [0.0111] ND [0.0252] ‐‐

SW8270E Acenaphthene 37 mg/kg ND [0.0117] ND [0.00584] ND [0.00575] ND [0.0131] ‐‐

SW8270E Acenaphthylene 18 mg/kg ND [0.0102] ND [0.00508] ND [0.00500] ND [0.0114] ‐‐

SW8270E Anthracene 390 mg/kg ND [0.0129] ND [0.00643] ND [0.00632] ND [0.0144] ‐‐

SW8270E Benzo(a)anthracene 0.7 mg/kg ND [0.0127] ND [0.00636] ND [0.00626] ND [0.0142] ‐‐

SW8270E Benzo(a)pyrene 1.5 mg/kg ND [0.0135] ND [0.00671] ND [0.00660] ND [0.0150] ‐‐

SW8270E Benzo(b)fluoranthene 15 mg/kg ND [0.0135] ND [0.00673] ND [0.00662] ND [0.0150] ‐‐

SW8270E Benzo(g,h,i)perylene 2300 mg/kg ND [0.0132] ND [0.00660] ND [0.00649] ND [0.0148] ‐‐

SW8270E Benzo(k)fluoranthene 150 mg/kg ND [0.0128] ND [0.00642] ND [0.00631] ND [0.0143] ‐‐

SW8270E Bis(2‐chlorethoxy)methane NS mg/kg ND [0.0217] ND [0.0108] ND [0.0107] ND [0.0242] ‐‐

SW8270E Bis(2‐chloroethyl)ether 0.00042 mg/kg ND [0.0239] ND [0.0119] ND [0.0117] ND [0.0267] ‐‐

SW8270E Bis(2‐ethylhexyl)phthalate 88 mg/kg ND [0.0916] ND [0.0457] ND [0.0450] ND [0.102] ‐‐

SW8270E Butyl benzyl phthalate 16 mg/kg ND [0.0226] ND [0.0113] ND [0.0111] ND [0.0252] ‐‐

SW8270E Chrysene 600 mg/kg ND [0.0143] ND [0.00717] ND [0.00706] ND [0.0160] ‐‐

SW8270E Dibenzo(a,h)anthracene…